Transformer.



11. L. COLBY.

TRANSFORMER.

APPLICATION FILED JAN.10,1913. 1,121,479. Patented Dec. 15, 1914.

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t L. COLBY.

TRANSFORMER.

APPLHJATION FILED JAN.

Patented Dec. 15, 1914.

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EDWARD L. COLBY, OF AUBURN. NEW YORK.

TRANSFORMER.

Specification of Letters Patent.

Patented Dec. 15, 1914.

Application filed January 10, 1913. Serial No. 741,272.

To all whom may concern:

Be it known that I, EDWARD L. COLBY, a citizen of the United States, residing at Auburn, in the county of Cayuga and State of'New York, have-invented new and useful 5 Improvements in Transformers, of which .the following is a specification.

"(This invention relates to certain novel and useful i 'provements in wireless telef gra'ph andftelephone instruments and has particulanapplication to what are commonly termed transformers, loose couplers or inductive'tuner's. L 'In carrying out the present invention, it is my purpose to provide an apparatus of the typeset forth wherein the effective lengths of the'windings may be changed and whereby any desired inductive-result between the primary and the secondary windings may be had under unusual conditions. I

It is also my purpose to provide a. device of the-class described which will embrace the'desired features of simplicity, eiiiciency and durability coupled with cheapness of cost' inmanufacture and installation and which is so designed as to make extremely sharp tuning possible, and capable of preventing interference, tuning up weak sig-' nals, and cutting out unwanted stations.

Furthermore, I aim to provide a novel arrangement of primary and secondary windings inductively related and means whereby the inductive lengths of the windings may be changed, there being combined therewith a shiftable or adjustable winding of varying effective length which may be readily'connected in series with either the primary or secondary and adjustable back and forth axially thereover for obtaining the desired inductive result between the primary and secondary windings under unusual conditions.

With the above and other objects in View, the invention consists in the construction, combination and arrangement of parts hereinafter set forth in and falling within the scope of the claims.

In the accompanying drawings; Figure 1 is a view in side elevation of a receiving transformer, loose coupler or inductive tuner. Fig. 2 is an end view thereof. Fig. 3 is a view of the opposite end. Fig. is a central longitudinal sectional view there of. Fig. 5 is a diagrammatic view of the windings of the transformer, loose coupler or inductive tuner, and Fig. (i a view of a detail of the invention.

Referring now to the accompanvingdrawingsin detail, the numeral 1 (5 I tubular or other support for the primaryand secondary windings I and S respectivelv. These windings may be formed of insulatc d wire orbare wire or metal ribbon having their convolutions and layers insulated in a well known manner. The windings are arranged at the ends of the tube 1 and are separated by an air space at between their adjacent or confronting ends. \Vith the primary winding codperates an arm 3 pivoted at one end on a supporting conductor 4 and movable in an are over the convolugnates a' tions or turns of the primary winding so that the effective length of such winding may be changed or varied, said supporting conductor 4 being provided witha binding post 4 whereby the. supporting conductorv a supportingconductor 6,the last-mentioned supportingconductor being equipped with a binding post 6 by means of which said conductor andthe arm thereon are in series with the secondary winding. The supporting conductors 4 and 6 are preferably fastened to the heads or odd pieces 7, 8 of the tubular support 1.

Means is provided for changing the inductive relation ofthe primary and secondary windings.

This means, in the present form of my invention, is in the form of a coil or winding '9 or a ring or hoop of metal mounted. on a hollow tubular body 10 disposed concentrically of the body 1 and slidable back and forth thereon or axially thereof and movable over either the primary or secondary winding, in accordance with the conditions under which the device is used. This adjustable or slidable coil or winding is adapted to be connectednn series with either the primary or secondary in accordance with the circumstances prevailing and means is provided whereby these connections may be interchanged readily and rapidly; In the present instance, each winding P, S has connected in series therewith a spring jack ll suitably fastened to the end wall or head of the tubular support l and spaced apart in such "manner as to form an arc, while betcx'eu: confronting ends of the jacks is mounts. a switch arm 1'2 having oneend pivoted as at 13 to the head 8 and formed of two s rips of metal insulated from each other, as shown in Fig. 5 so that when the snitch arm is moved into engagement with one or theother of the jacks, the respective winding 1, S will be placed in series with the adjustable winding or coil.

l'iccured to. the hollow tnbnla'r,b0dy 1O and spanning the dcnwclrrticars of the coil or windirw, 9 thereon is :1 supporting conductor 14 to which is pivoted one end of an arm 15 movable in an are over the convolutions of the adjustable coil so as to vary the cli'ective length thereof, a binding post 1% .l'ieinggcai" ri e-d by the supporting conductor 14 \vhe'rea' by the latter and the respective arm are mug nccted. in scrics with the adjirritable-winding or coil, as clearly illustrated in Fig Any other suitrblc incans n'iay be employed for effecting this change. By means )f a' (lerice of the character shown and "described a large variety of in ductive e l'lectfs may be obtained'by shifting the swinging arms of the primary and sec ondary windings, by shiftingthe adjustable or outer coil or winding axially of'and over the primary and secondary winding; and by manipulating the arm 15"so"that it is possible to tune up weak signals to a considerable extent and otherwise give sharp" tuning results.

7 'YVhile I have herein shown and described A! I. one preferred fOl'ln l. lily Invention Uy' Wily of illustration, 1 wish it to be understood that I do not limit or confine myself to the precise details of construction herein de- ;scribed and delineated, as modificationand variationmay be made; within the scope of the claims and without departing from the spirit of: the invention.

I claim:

1. An apparatus of the class described comprising a tubular support, primary and secondary windings .on said'support at "the opposite ends thereof and separated by an air s ace, a hollow tubularbody surround; ing said tubular support concentrically thereof and of a width .1653 than that of said support, a coil on-said ,body, said body being movable over one 'or the other of said primary and secondary windings, means for changing the effective length of each of the leans :fer connpcting; the last-mentioned \\-'1nding in series with one or the other of the first windings.

first-mentioned. windings, and adjustable An apparatus of the class described comprising primary and secondary windings I arranged on a common axis with the r; aii a' cent ends separated by an air space, an adqnstable winding adapted to be connected in' windings, and adjustable means 'for efiect r. mg such interchangeable.connection.

3. An apparatus of; the class described m-nnprising primary and secondary/windings arranged on a common with their ad3acent ends separated by 'an air space, 'an adjustable winding adapt'edtobe connected in series with one or,,thei'other .fof thefirst windings, a spring jack connected in series with each of said fir st-'wi1 idings,-f anda; switch arm composed ,oftwo strips "f'metal insulated from each ether-and" donnected series with one or the other offthe first i with theopposite ends ofs'a'id-Fadjustable 

